[Halld-pid] Time-of-Flight Meeting Minutes, May 6, 2020

[Mark Ito]

Folks,

Please find the minutes for the meeting held before the Collaboration 
Meeting here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_May_6,_2020#Minutes> 
and below.

   -- Mark


    GlueX TOF Meeting, May 6, 2020,Minutes

Present: Mark Ito (chair), Susan Schadmand, Simon Taylor, Beni Zihlmann

There is a recording of this meeting <https://bluejeans.com/s/ALYRW/> on 
the BlueJeans site. Use your JLab credentials to gain access.


      Review of minutes from the last meeting

We went over the minutes from April 8 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_April_8,_2020#Minutes>. 
Beni reported that the calibrations for the last run period are 
completed now. Time resolutions is close to 100 ps for all areas of TOF II.


      Calibration

Beni presented a study of charged track extrapolation to the TOF array.

Comparison between TOF survey data and tracking with associated TOF 
points. The following plots shows tracking data where the dimensions in 
x and y are the track positions at the TOF plane based on extrapolating 
the tracks all the way out to the TOF. The colored shadings are the x/y 
position of the track at the TOF with the color indicating which TOF 
paddle provided the TOF point associated with the track. NO EXPLICIT TOF 
DATA ENTERS HERE! The horizontal lines indicate the location of the 
"nominal" TOF paddle positions. The profile data is the mean track 
position of all tracks along the paddles. AGAIN NO PADDLE DATA IS USED 
HERE OTHER THAN YES THE PADDLE PROVIDED THE HIT! The three large black 
dots indicate the location of the survey.

Shown are the data for survey points 1,2 and 3 which are along the 
horizontal axis between paddle 19 (last 3cm wide) and paddle 20 (first 
4.5cm wide). These are above the beam hole. Q indicate the charge of the 
tracked particle.

The survey points are shown in the following picture

TOFsurveypoints.jpg 
<https://halldweb.jlab.org/wiki/index.php/File:TOFsurveypoints.jpg>

The first two plots below show the data below the beam line

Survey P19P20 Q1 run71673.gif 
<https://halldweb.jlab.org/wiki/index.php/File:Survey_P19P20_Q1_run71673.gif> 


Survey P19P20 Q-1 run71673.gif 
<https://halldweb.jlab.org/wiki/index.php/File:Survey_P19P20_Q-1_run71673.gif> 


The second two plots below are data from above the beam line

Survey P27P28 Q1 run71673.gif 
<https://halldweb.jlab.org/wiki/index.php/File:Survey_P27P28_Q1_run71673.gif> 


Survey P27P28 Q-1 run71673.gif 
<https://halldweb.jlab.org/wiki/index.php/File:Survey_P27P28_Q-1_run71673.gif> 


The next two plots are data from far below the beam line

Survey P7P8 Q1 run71673.gif 
<https://halldweb.jlab.org/wiki/index.php/File:Survey_P7P8_Q1_run71673.gif>

Survey P7P8 Q-1 run71673.gif 
<https://halldweb.jlab.org/wiki/index.php/File:Survey_P7P8_Q-1_run71673.gif> 


And last but not least the two plots with far above the beam hole for 
both charges

Survey P39P40 Q1 run71673.gif 
<https://halldweb.jlab.org/wiki/index.php/File:Survey_P39P40_Q1_run71673.gif> 


Survey P39P40 Q-1 run71673.gif 
<https://halldweb.jlab.org/wiki/index.php/File:Survey_P39P40_Q-1_run71673.gif> 


Beni continues to try to understand the differences between charged 
track extrapolation, survey data, and the nominal TOF geometry. He will 
also compare with similar studies for TOF I.

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  * This page was last modified on 20 May 2020, at 10:59.

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